Re: [PATCH v3 02/18] hw/i386: Introduce X86CPUTopoInfo to contain topology info

[Igor Mammedov]

On Tue, 03 Dec 2019 18:37:08 -0600
Babu Moger <address@hidden> wrote:

> This is an effort to re-arrange few data structure for better readability.
> Add X86CPUTopoInfo which will have all the topology informations required
> to build the cpu topology. There is no functional changes.
> 
> Signed-off-by: Babu Moger <address@hidden>

Reviewed-by: Igor Mammedov <address@hidden>

> ---
>  hw/i386/pc.c               |   40 +++++++++++++++++++++++++++-------------
>  include/hw/i386/topology.h |   38 ++++++++++++++++++++++++--------------
>  2 files changed, 51 insertions(+), 27 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 5bd2ffccb7..8c23b1e8c9 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -878,11 +878,15 @@ static uint32_t 
> x86_cpu_apic_id_from_index(PCMachineState *pcms,
>  {
>      MachineState *ms = MACHINE(pcms);
>      PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
> +    X86CPUTopoInfo topo_info;
>      uint32_t correct_id;
>      static bool warned;
>  
> -    correct_id = x86_apicid_from_cpu_idx(pcms->smp_dies, ms->smp.cores,
> -                                         ms->smp.threads, cpu_index);
> +    topo_info.dies_per_pkg = pcms->smp_dies;
> +    topo_info.cores_per_die = ms->smp.cores;
> +    topo_info.threads_per_core = ms->smp.threads;
> +
> +    correct_id = x86_apicid_from_cpu_idx(&topo_info, cpu_index);
>      if (pcmc->compat_apic_id_mode) {
>          if (cpu_index != correct_id && !warned && !qtest_enabled()) {
>              error_report("APIC IDs set in compatibility mode, "
> @@ -2219,6 +2223,7 @@ static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev,
>      PCMachineState *pcms = PC_MACHINE(hotplug_dev);
>      unsigned int smp_cores = ms->smp.cores;
>      unsigned int smp_threads = ms->smp.threads;
> +    X86CPUTopoInfo topo_info;
>  
>      if(!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {
>          error_setg(errp, "Invalid CPU type, expected cpu type: '%s'",
> @@ -2226,6 +2231,10 @@ static void pc_cpu_pre_plug(HotplugHandler 
> *hotplug_dev,
>          return;
>      }
>  
> +    topo_info.dies_per_pkg = pcms->smp_dies;
> +    topo_info.cores_per_die = smp_cores;
> +    topo_info.threads_per_core = smp_threads;
> +
>      env->nr_dies = pcms->smp_dies;
>  
>      /*
> @@ -2281,16 +2290,14 @@ static void pc_cpu_pre_plug(HotplugHandler 
> *hotplug_dev,
>          topo_ids.die_id = cpu->die_id;
>          topo_ids.core_id = cpu->core_id;
>          topo_ids.smt_id = cpu->thread_id;
> -        cpu->apic_id = apicid_from_topo_ids(pcms->smp_dies, smp_cores,
> -                                            smp_threads, &topo_ids);
> +        cpu->apic_id = apicid_from_topo_ids(&topo_info, &topo_ids);
>      }
>  
>      cpu_slot = pc_find_cpu_slot(MACHINE(pcms), cpu->apic_id, &idx);
>      if (!cpu_slot) {
>          MachineState *ms = MACHINE(pcms);
>  
> -        x86_topo_ids_from_apicid(cpu->apic_id, pcms->smp_dies,
> -                                 smp_cores, smp_threads, &topo_ids);
> +        x86_topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
>          error_setg(errp,
>              "Invalid CPU [socket: %u, die: %u, core: %u, thread: %u] with"
>              " APIC ID %" PRIu32 ", valid index range 0:%d",
> @@ -2311,8 +2318,7 @@ static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev,
>      /* TODO: move socket_id/core_id/thread_id checks into x86_cpu_realizefn()
>       * once -smp refactoring is complete and there will be CPU private
>       * CPUState::nr_cores and CPUState::nr_threads fields instead of globals 
> */
> -    x86_topo_ids_from_apicid(cpu->apic_id, pcms->smp_dies,
> -                             smp_cores, smp_threads, &topo_ids);
> +    x86_topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
>      if (cpu->socket_id != -1 && cpu->socket_id != topo_ids.pkg_id) {
>          error_setg(errp, "property socket-id: %u doesn't match set apic-id:"
>              " 0x%x (socket-id: %u)", cpu->socket_id, cpu->apic_id, 
> topo_ids.pkg_id);
> @@ -2694,19 +2700,28 @@ static int64_t pc_get_default_cpu_node_id(const 
> MachineState *ms, int idx)
>  {
>     X86CPUTopoIDs topo_ids;
>     PCMachineState *pcms = PC_MACHINE(ms);
> +   X86CPUTopoInfo topo_info;
> +
> +   topo_info.dies_per_pkg = pcms->smp_dies;
> +   topo_info.cores_per_die = ms->smp.cores;
> +   topo_info.threads_per_core = ms->smp.threads;
>  
>     assert(idx < ms->possible_cpus->len);
>     x86_topo_ids_from_apicid(ms->possible_cpus->cpus[idx].arch_id,
> -                            pcms->smp_dies, ms->smp.cores,
> -                            ms->smp.threads, &topo_ids);
> +                            &topo_info, &topo_ids);
>     return topo_ids.pkg_id % ms->numa_state->num_nodes;
>  }
>  
>  static const CPUArchIdList *pc_possible_cpu_arch_ids(MachineState *ms)
>  {
>      PCMachineState *pcms = PC_MACHINE(ms);
> -    int i;
>      unsigned int max_cpus = ms->smp.max_cpus;
> +    X86CPUTopoInfo topo_info;
> +    int i;
> +
> +    topo_info.dies_per_pkg = pcms->smp_dies;
> +    topo_info.cores_per_die = ms->smp.cores;
> +    topo_info.threads_per_core = ms->smp.threads;
>  
>      if (ms->possible_cpus) {
>          /*
> @@ -2727,8 +2742,7 @@ static const CPUArchIdList 
> *pc_possible_cpu_arch_ids(MachineState *ms)
>          ms->possible_cpus->cpus[i].vcpus_count = 1;
>          ms->possible_cpus->cpus[i].arch_id = 
> x86_cpu_apic_id_from_index(pcms, i);
>          x86_topo_ids_from_apicid(ms->possible_cpus->cpus[i].arch_id,
> -                                 pcms->smp_dies, ms->smp.cores,
> -                                 ms->smp.threads, &topo_ids);
> +                                 &topo_info, &topo_ids);
>          ms->possible_cpus->cpus[i].props.has_socket_id = true;
>          ms->possible_cpus->cpus[i].props.socket_id = topo_ids.pkg_id;
>          if (pcms->smp_dies > 1) {
> diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h
> index 6c184f3115..cf1935d548 100644
> --- a/include/hw/i386/topology.h
> +++ b/include/hw/i386/topology.h
> @@ -52,6 +52,12 @@ typedef struct X86CPUTopoIDs {
>      unsigned smt_id;
>  } X86CPUTopoIDs;
>  
> +typedef struct X86CPUTopoInfo {
> +    unsigned dies_per_pkg;
> +    unsigned cores_per_die;
> +    unsigned threads_per_core;
> +} X86CPUTopoInfo;
> +
>  /* Return the bit width needed for 'count' IDs
>   */
>  static unsigned apicid_bitwidth_for_count(unsigned count)
> @@ -119,11 +125,13 @@ static inline unsigned apicid_pkg_offset(unsigned 
> nr_dies,
>   *
>   * The caller must make sure core_id < nr_cores and smt_id < nr_threads.
>   */
> -static inline apic_id_t apicid_from_topo_ids(unsigned nr_dies,
> -                                             unsigned nr_cores,
> -                                             unsigned nr_threads,
> +static inline apic_id_t apicid_from_topo_ids(X86CPUTopoInfo *topo_info,
>                                               const X86CPUTopoIDs *topo_ids)
>  {
> +    unsigned nr_dies = topo_info->dies_per_pkg;
> +    unsigned nr_cores = topo_info->cores_per_die;
> +    unsigned nr_threads = topo_info->threads_per_core;
> +
>      return (topo_ids->pkg_id  << apicid_pkg_offset(nr_dies, nr_cores, 
> nr_threads)) |
>             (topo_ids->die_id  << apicid_die_offset(nr_dies, nr_cores, 
> nr_threads)) |
>             (topo_ids->core_id << apicid_core_offset(nr_dies, nr_cores, 
> nr_threads)) |
> @@ -133,12 +141,14 @@ static inline apic_id_t apicid_from_topo_ids(unsigned 
> nr_dies,
>  /* Calculate thread/core/package IDs for a specific topology,
>   * based on (contiguous) CPU index
>   */
> -static inline void x86_topo_ids_from_idx(unsigned nr_dies,
> -                                         unsigned nr_cores,
> -                                         unsigned nr_threads,
> +static inline void x86_topo_ids_from_idx(X86CPUTopoInfo *topo_info,
>                                           unsigned cpu_index,
>                                           X86CPUTopoIDs *topo_ids)
>  {
> +    unsigned nr_dies = topo_info->dies_per_pkg;
> +    unsigned nr_cores = topo_info->cores_per_die;
> +    unsigned nr_threads = topo_info->threads_per_core;
> +
>      topo_ids->pkg_id = cpu_index / (nr_dies * nr_cores * nr_threads);
>      topo_ids->die_id = cpu_index / (nr_cores * nr_threads) % nr_dies;
>      topo_ids->core_id = cpu_index / nr_threads % nr_cores;
> @@ -149,11 +159,13 @@ static inline void x86_topo_ids_from_idx(unsigned 
> nr_dies,
>   * based on APIC ID
>   */
>  static inline void x86_topo_ids_from_apicid(apic_id_t apicid,
> -                                            unsigned nr_dies,
> -                                            unsigned nr_cores,
> -                                            unsigned nr_threads,
> +                                            X86CPUTopoInfo *topo_info,
>                                              X86CPUTopoIDs *topo_ids)
>  {
> +    unsigned nr_dies = topo_info->dies_per_pkg;
> +    unsigned nr_cores = topo_info->cores_per_die;
> +    unsigned nr_threads = topo_info->threads_per_core;
> +
>      topo_ids->smt_id = apicid &
>              ~(0xFFFFFFFFUL << apicid_smt_width(nr_dies, nr_cores, 
> nr_threads));
>      topo_ids->core_id =
> @@ -169,14 +181,12 @@ static inline void x86_topo_ids_from_apicid(apic_id_t 
> apicid,
>   *
>   * 'cpu_index' is a sequential, contiguous ID for the CPU.
>   */
> -static inline apic_id_t x86_apicid_from_cpu_idx(unsigned nr_dies,
> -                                                unsigned nr_cores,
> -                                                unsigned nr_threads,
> +static inline apic_id_t x86_apicid_from_cpu_idx(X86CPUTopoInfo *topo_info,
>                                                  unsigned cpu_index)
>  {
>      X86CPUTopoIDs topo_ids;
> -    x86_topo_ids_from_idx(nr_dies, nr_cores, nr_threads, cpu_index, 
> &topo_ids);
> -    return apicid_from_topo_ids(nr_dies, nr_cores, nr_threads, &topo_ids);
> +    x86_topo_ids_from_idx(topo_info, cpu_index, &topo_ids);
> +    return apicid_from_topo_ids(topo_info, &topo_ids);
>  }
>  
>  #endif /* HW_I386_TOPOLOGY_H */
> 
>